US4666246A - Illuminating optical system for endoscopes - Google Patents
Illuminating optical system for endoscopesDownload PDFInfo
- Publication number
- US4666246A US4666246AUS06/652,566US65256684AUS4666246AUS 4666246 AUS4666246 AUS 4666246AUS 65256684 AUS65256684 AUS 65256684AUS 4666246 AUS4666246 AUS 4666246A
- Authority
- US
- United States
- Prior art keywords
- concave lens
- optical system
- illuminating optical
- light guide
- transparent plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/0008—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted at the end of the fibre
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2461—Illumination
- G02B23/2469—Illumination using optical fibres
Definitions
- This inventionrelates to an illuminating optical system for endoscopes.
- an illuminating optical system using a light guideis built-in.
- the light emitted from such light guideis so low in the intensity toward the periphery that the periphery of the visual field is dark.
- a primary object of the present inventionis to provide an illuminating optical system for endoscopes wherein the illuminating light amount on the periphery of the visual field is sufficient and the light amount loss is less.
- this objectis attained by arranging a concave lens having a weaker refractive power in the peripheral part in front of the exit end of a light guide.
- the peripheral part of the concave lensis shaped as a flat surface, a concave lens of a large radius of curvature or a convex lens of a large radius of curvature.
- a transparent memberis interposed between the exit end of the light guide and the concave lens and at least one of the concave lens and transparent member is formed of single fibers.
- FIG. 1is a schematic view showing a conventional illuminating optical system for endoscope
- FIG. 2is a enlarged view of a part of FIG. 1;
- FIG. 3is a schematic view showing an embodiment of the illuminating optical system for endoscopes according to the present invention.
- FIGS. 4, 5, 6 and 7are views showing respectively other embodiments different from one another according to the present invention.
- the present inventionshall be explained in the following with reference to the embodiments shown in the drawings.
- the first embodiment of the present inventionis shown in FIG. 3.
- the reference numeral 11denotes such transparent member as, for example, a glass plate and 12 denotes a concave lens having a flat light passing part on the periphery.
- a light L 1 at an angle with the axis of the light guide 2will pass through the flat light passing part 12a of the concave lens 12 and will illuminate the peripheral part of the visual field of the endoscope and a light L 2 parallel with the axis of the light guide 2 will pass through the central lens part of the concave lens 12, will be therefore refracted by the action of the lens and will illuminate the peripheral part of the visual field of the endoscope.
- the semi-diameter of the light guide 2is represented by c
- the semi-diameter of the lens part of the concave lens 12is represented by r
- the thickness of the transparent member 11is represented by a
- the angle of inclination within the transparent member 11 of a light L 3 having a maximum angle of inclination to the axis of the light guide 2is represented by ⁇
- the light parallel with the axismay pass through the flat light passing part 12a without being refracted to some extent and therefore the condition can be relaxed until
- FIG. 4shows another embodiment of the present invention.
- the reference numeral 11'denotes a transparent member formed of a single fiber
- 12'denotes a concave lens formed of a single fiber and having a flat light passing part 12'a on the periphery
- 13denotes an optical member formed of a single fiber and for extending the total length of the optical system.
- the operation of the optical member 13is the same as in the embodiment in FIG. 3. As the single fiber is used, there will be no loss of the light amount. Therefore, the optical system can be made thinner and smaller.
- FIG. 5shows another embodiment of the present invention.
- This embodimentis the same as that of FIG. 3 in its formation and function, except that the transparent member 11 is provided between the light guide 2 and the concave lens 12 in FIG. 3.
- the transparent memberis not provided as mentioned now, when the distance between the concave lens and the exit end of the light guide is represented by a and the angle of inclination made by light having the maximum angle with the optical axis among light emitted from the light guide is represented by ⁇ , it is only necessary to arrange each component to satisfy, similar to the embodiment of FIG. 3, such relations as shown by formulae:
- FIG. 6instead of the concave lens 12 having the flat light passing part 12a on the periphery in the embodiment in FIG. 3, a double concave lens 14 having a concave lens part in which refractive power is weaker than in the center part and a concave lens part in which refractive power is stronger than in the peripheral part is arranged. In this case, a range wider than in the embodiment in FIG.
- nrepresents the refractive index of the transparent member 11
- brepresents the distance between the boundary line of the two convex lens parts of the double lens and the exit end face of the transparent member
- a concave lens 15 having a convex lens part in which refractive power is weaker than in the center part and a concave lens part in the center partis arranged. Therefore, the light having passed through the peripheral part of the concave lens 15 will be a little condensed by the action of the convex lens part and will illuminate the peripheral part of the visual field of the endoscope. This formation will be effective particularly in case the light distribution of the light guide 2 itself is comparatively wide.
- the shapes of the concave lens and convex lensmay be nonspherical.
- the concave lens 14 or 15is formed of a plastic glass molding or the like, it will be able to be produced more cheaply.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Endoscopes (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
Abstract
Description
(a) Field of the invention:
This invention relates to an illuminating optical system for endoscopes.
(b) Description of the prior art:
Generally, in an endoscope, an illuminating optical system using a light guide is built-in. However, there has been a defect that the light emitted from such light guide is so low in the intensity toward the periphery that the periphery of the visual field is dark.
Therefore, it has been generally practiced to arrange aconcave lens 3 in front of the emittingend 2a of alight guide 2 within anendoscope tip part 1 as shown in FIG. 1. However, in this formation, the illuminating light amount on the periphery increases but can not be said to be sufficient and the periphery of the visual field is still dark. Further, there has been a defect that, in case theconcave lens 3 is made the refractive power stronger to increase the peripheral light amount, as shown in FIG. 2, a part of the light emitted from the peripheral part of theexit end 2a of thelight guide 2 will be all reflected by the exit surface of theconcave lens 3 as shown by the arrow A and therefore the loss of the illuminating light amount on the periphery will be large.
In view of the above mentioned points, a primary object of the present invention is to provide an illuminating optical system for endoscopes wherein the illuminating light amount on the periphery of the visual field is sufficient and the light amount loss is less.
According to the present invention, this object is attained by arranging a concave lens having a weaker refractive power in the peripheral part in front of the exit end of a light guide. The peripheral part of the concave lens is shaped as a flat surface, a concave lens of a large radius of curvature or a convex lens of a large radius of curvature. Thereby, a light parallel with the axis of the light guide and a light at an angle with said axis will illuminate the peripheral part of the visual field of the endoscope, the light amount will not be lost by total reflection on the exit end surface in such case and therefore a bright illumination will be able to be made over the entire visual field.
According to a preferred formation of the present invention, a transparent member is interposed between the exit end of the light guide and the concave lens and at least one of the concave lens and transparent member is formed of single fibers. Thereby, an illuminating system for endoscopes lower in the light amount loss can be obtained.
This and other objects of the present invention will become more apparent during the course of the following detailed description and appended claims.
FIG. 1 is a schematic view showing a conventional illuminating optical system for endoscope;
FIG. 2 is a enlarged view of a part of FIG. 1;
FIG. 3 is a schematic view showing an embodiment of the illuminating optical system for endoscopes according to the present invention; and
FIGS. 4, 5, 6 and 7 are views showing respectively other embodiments different from one another according to the present invention.
The present invention shall be explained in the following with reference to the embodiments shown in the drawings. The first embodiment of the present invention is shown in FIG. 3. Thereference numeral 11 denotes such transparent member as, for example, a glass plate and 12 denotes a concave lens having a flat light passing part on the periphery.
As this embodiment is formed as in the above, a light L1 at an angle with the axis of thelight guide 2 will pass through the flatlight passing part 12a of theconcave lens 12 and will illuminate the peripheral part of the visual field of the endoscope and a light L2 parallel with the axis of thelight guide 2 will pass through the central lens part of theconcave lens 12, will be therefore refracted by the action of the lens and will illuminate the peripheral part of the visual field of the endoscope. Here, in case the semi-diameter of thelight guide 2 is represented by c, the semi-diameter of the lens part of theconcave lens 12 is represented by r, the thickness of thetransparent member 11 is represented by a and the angle of inclination within thetransparent member 11 of a light L3 having a maximum angle of inclination to the axis of thelight guide 2 is represented by α, in order to obtain a flavorable illuminating light, it will be required to satisfy the under-mentioned two conditional formulae (1) and (2).
That is to say, in order that all the lights parallel with the axis of thelight guide 2 may be refracted by the lens part of theconcave lens 12,
r>c (1)
must be satisfied and, in order that at least one of the light rays to be led by each of all the light guide fibers may pass through the flatlight passing part 12a of theconcave lens 12,
a·tan α>r (2)
must be satisfied. Now, in the formula (1), the light parallel with the axis may pass through the flatlight passing part 12a without being refracted to some extent and therefore the condition can be relaxed until
r>0.5c (1)'
Also, in the formula (2), even if the light having the maximum angle of inclination passes through the lens part of theconcave lens 12, the intensity of the light will be so weak that the loss will be slight and therefore the condition will be able to be relaxed until
a·tan α>(r/3) (2)'
From the combination of forumulae (1) and (2), a·tan α>r>c is obtained and from formulae (1)' and (2)', 3a·tan α>r>1/2c is determined.
FIG. 4 shows another embodiment of the present invention. The reference numeral 11' denotes a transparent member formed of a single fiber, 12' denotes a concave lens formed of a single fiber and having a flat light passing part 12'a on the periphery and 13 denotes an optical member formed of a single fiber and for extending the total length of the optical system. The operation of theoptical member 13 is the same as in the embodiment in FIG. 3. As the single fiber is used, there will be no loss of the light amount. Therefore, the optical system can be made thinner and smaller.
FIG. 5 shows another embodiment of the present invention. This embodiment is the same as that of FIG. 3 in its formation and function, except that thetransparent member 11 is provided between thelight guide 2 and theconcave lens 12 in FIG. 3. In case the transparent member is not provided as mentioned now, when the distance between the concave lens and the exit end of the light guide is represented by a and the angle of inclination made by light having the maximum angle with the optical axis among light emitted from the light guide is represented by α, it is only necessary to arrange each component to satisfy, similar to the embodiment of FIG. 3, such relations as shown by formulae:
a·tan α>r>c
and
3a·tan α>r>1/2c.
In FIG. 6, instead of theconcave lens 12 having the flatlight passing part 12a on the periphery in the embodiment in FIG. 3, a doubleconcave lens 14 having a concave lens part in which refractive power is weaker than in the center part and a concave lens part in which refractive power is stronger than in the peripheral part is arranged. In this case, a range wider than in the embodiment in FIG. 3 can be illuminated and the conditional formulae (1)' and (2)' can be applied but, on the conditional formula (2)', instead of the thickness a of thetransparent member 11, a thickness a' given by a'=a+nb (wherein the symbol n represents the refractive index of thetransparent member 11 and b represents the distance between the boundary line of the two convex lens parts of the double lens and the exit end face of the transparent member) is used and a conditional formula of
a'·tan α=(a+nb) tan α>(r/3)
is applied. That is to say, in case the transparent member and air space are provided between the exit end face of the light guide and the concave lens, it is only necessary to use the sum of the thickness of the transparent member and the value obtained by multiplying the length of the air space by the refractive index of the transparent member, instead of the thickness of the transparent member in FIG. 3.
In FIG. 7, instead of theconcave lens 12 having the flatlight passing part 12a on the periphery in the embodiment in FIG. 3, aconcave lens 15 having a convex lens part in which refractive power is weaker than in the center part and a concave lens part in the center part is arranged. Therefore, the light having passed through the peripheral part of theconcave lens 15 will be a little condensed by the action of the convex lens part and will illuminate the peripheral part of the visual field of the endoscope. This formation will be effective particularly in case the light distribution of thelight guide 2 itself is comparatively wide.
By the way, it is needless to say that, in all of the above embodiments, the shapes of the concave lens and convex lens may be nonspherical. In the embodiments in FIGS. 6 and 7, if theconcave lens
Claims (20)
1. An illuminating optical system for endoscopes wherein said system is provided with a light guide, a concave lens arranged on the exit end side of said light guide and having, around a center part, a peripheral part in which refractive power is weaker than in said center part and a transparent plate arranged between said concave lens and the exit end face of said light guide, and the positions and sizes of said light guide, said transparent plate and said concave lens are selected to satisfy the following formula:
3(a+nb) tan α>r>1/2c
where a is the thickness of the transparent plate, n is the refractive index of the transparent plate, b is the length obtained by deducting the thickness of the transparent plate from the distance between the exit end face of the light guide and the boundary line between the center part and the peripheral part of the concave lens, α is the maximum value of the angle made by light emitted from the light guide with the optical axis in the transparent plate, r is the radius of the concave lens in the center part, and c is the radius of the exit end face of the light guide.
2. An illuminating optical system for endoscopes according to claim 1, wherein said system satisfies the following formula:
(a+nb) tan α>r>c.
3. An illuminating optical system for endoscopes according to claim 1 or 2, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a flat plate.
4. An illuminating optical system for endoscopes according to claim 3, wherein said concave lens and said transparent plate are formed of single fibers.
5. An illuminating optical system for endoscopes according to claim 4, wherein said transparent plate comprising the single fibers is arranged on the exit end side of said concave lens.
6. An illuminating optical system for endoscopes according to claim 1 or 2, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a convex lens.
7. An illuminating optical system for endoscopes according to claim 6, wherein said concave lens and said transparent plate are formed of single fibers.
8. An illuminating optical system for endoscopes according to claim 7, wherein said transparent plate comprising the single fibers is arranged on the exit end side of said concave lens.
9. An illuminating optical system for endoscopes according to claim 1 or 2, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a concave lens whose radius of curvature is larger than in the center part.
10. An illuminating optical system for endoscopes according to claim 9, wherein said concave lens and said transparent plate are formed of single fibers.
11. An illuminating optical system for endoscopes wherein said system is provided with a light guide and a concave lens arranged on the exit end side of said light guide and having, around a center part, a peripheral part in which refractive power is weaker than in said center part, and the positions and sizes of said light guide and said concave lens are selected to satisfy the following formula:
3a·tan α>r>1/2c
where a is the distance between the exit end of the light guide and the concave lens, α is the maximum value of the angle made by light emitted from the light guide with the optical axis, r is the radius of the concave lens in the center part, and c is the radius of the exit end face of the light guide.
12. An illuminating optical system for endoscopes according to claim 11, wherein said system is satisfied with the following formula:
a·tan α>r>c.
13. An illuminating optical system for endoscopes according to claim 11 or 12, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a flat plate.
14. An illuminating optical system for endoscopes according to claim 13, wherein said concave lens and said transparent plate are formed of single fibers.
15. An illuminating optical system for endoscopes according to claim 14, wherein said transparent plate comprising the single fibers is arranged on the exit end side of said concave lens.
16. An illuminating optical system for endoscopes according to claim 11 or 12, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a convex lens.
17. An illuminating optical system for endoscopes according to claim 16, wherein said concave lens and said transparent plate are formed of single fibers.
18. An illuminating optical system for endoscopes according to claim 11 or 12, wherein said peripheral part in which the refractive power is weaker is formed in the shape of a concave lens whose radius of curvature is larger than in the center part.
19. An illuminating optical system for endoscopes according to claim 18, wherein said concave lens and said transparent plate are formed of single fibers.
20. An illuminating optical system for endoscopes according to claim 19, wherein said transparent plate comprising the single fibers is arranged on the exit end side of said concave lens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58-173628 | 1983-09-20 | ||
| JP58173628AJPS6064321A (en) | 1983-09-20 | 1983-09-20 | Lighting optical system of endoscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4666246Atrue US4666246A (en) | 1987-05-19 |
Family
ID=15964132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/652,566Expired - Fee RelatedUS4666246A (en) | 1983-09-20 | 1984-09-20 | Illuminating optical system for endoscopes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4666246A (en) |
| JP (1) | JPS6064321A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4733937A (en)* | 1986-10-17 | 1988-03-29 | Welch Allyn, Inc. | Illuminating system for endoscope or borescope |
| US4747660A (en)* | 1983-08-12 | 1988-05-31 | Olympus Optical Co., Ltd. | Light transmitter |
| US6129662A (en)* | 1996-06-03 | 2000-10-10 | Cogent Light Technologies, Inc. | Surgical tool with surgical field illuminator |
| US20080158348A1 (en)* | 2006-12-29 | 2008-07-03 | General Electric Company | Inspection apparatus having illumination assembly |
| US20090027917A1 (en)* | 2007-07-23 | 2009-01-29 | Inventec Corporation | Optical fiber indicator light |
| US20120163015A1 (en)* | 2010-06-10 | 2012-06-28 | Olympus Medical Systems Corp. | Light source apparatus and endoscope system |
| US10478053B2 (en)* | 2015-10-07 | 2019-11-19 | Olympus Corporation | Endoscope illumination device |
| CN112987281A (en)* | 2021-03-23 | 2021-06-18 | 南京锐普创科科技有限公司 | Optical fiber image transmission light source endoscope light source increasing structure and preparation method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013061874A1 (en)* | 2011-10-28 | 2013-05-02 | オリンパスメディカルシステムズ株式会社 | Endoscope illumination optical assembly |
| EP3249786A1 (en) | 2016-05-25 | 2017-11-29 | Celeroton AG | Electrical machine and rotor for an electrical machine |
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| JPS57170701U (en)* | 1981-04-21 | 1982-10-27 | ||
| JPS589208U (en)* | 1981-07-09 | 1983-01-21 | 石川島播磨重工業株式会社 | steel plate cooling system |
- 1983
- 1983-09-20JPJP58173628Apatent/JPS6064321A/enactiveGranted
- 1984
- 1984-09-20USUS06/652,566patent/US4666246A/ennot_activeExpired - Fee Related
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| US3918072A (en)* | 1972-12-13 | 1975-11-04 | Olympus Optical Co | Single-lens reflex optical system for an endoscope |
| US3918438A (en)* | 1973-04-16 | 1975-11-11 | Olympus Optical Co | Endoscope capable of changing over the directions of visual field |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4747660A (en)* | 1983-08-12 | 1988-05-31 | Olympus Optical Co., Ltd. | Light transmitter |
| US4733937A (en)* | 1986-10-17 | 1988-03-29 | Welch Allyn, Inc. | Illuminating system for endoscope or borescope |
| US6129662A (en)* | 1996-06-03 | 2000-10-10 | Cogent Light Technologies, Inc. | Surgical tool with surgical field illuminator |
| US20080158348A1 (en)* | 2006-12-29 | 2008-07-03 | General Electric Company | Inspection apparatus having illumination assembly |
| US8514278B2 (en) | 2006-12-29 | 2013-08-20 | Ge Inspection Technologies Lp | Inspection apparatus having illumination assembly |
| US20090027917A1 (en)* | 2007-07-23 | 2009-01-29 | Inventec Corporation | Optical fiber indicator light |
| US20120163015A1 (en)* | 2010-06-10 | 2012-06-28 | Olympus Medical Systems Corp. | Light source apparatus and endoscope system |
| CN102884367A (en)* | 2010-06-10 | 2013-01-16 | 奥林巴斯医疗株式会社 | Light source device |
| US8459853B2 (en)* | 2010-06-10 | 2013-06-11 | Olympus Medical Systems Corp. | Light source apparatus having light distribution correction optical element and endoscope system including such apparatus |
| US10478053B2 (en)* | 2015-10-07 | 2019-11-19 | Olympus Corporation | Endoscope illumination device |
| CN112987281A (en)* | 2021-03-23 | 2021-06-18 | 南京锐普创科科技有限公司 | Optical fiber image transmission light source endoscope light source increasing structure and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0555846B2 (en) | 1993-08-18 |
| JPS6064321A (en) | 1985-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment | Owner name:OLYMPUS OPTICAL CO., LTD HATAGAYA 2-43-2 SHIBUYA-K Free format text:ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:NISHIOKA, KIMIHIKO;KIMURA, HIROYUKI;REEL/FRAME:004313/0172 Effective date:19840904 Owner name:OLYMPUS OPTICAL CO., LTD,JAPAN Free format text:ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NISHIOKA, KIMIHIKO;KIMURA, HIROYUKI;REEL/FRAME:004313/0172 Effective date:19840904 | |
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